Button-hole cutter



(Model.)

J. -W. LUFKIN.

BUTTON HOLE CUTTER.l No.\262,961. Patented Aug. 22, 1882.

' UNITED STATES PATENT Clinica.

JOHN W. LUFKIN, OF CHELSEA, MASSACHUSETTS.

BUTTON-HOLE CUTTER.

SPECIFICATION forming part of Letters Fatent No. 262,961, dated August 22, 1882.

Application inea May en, rss2. (Model.)

To all 'whom it may concern:

Be it known that l, JOHN W. LUFKIN, of Chelsea, county of Suffolk, State ofMassachusetts, have invented an Improvement in Button-Hole Cutters, of which the following description,in connection with the accompanying drawings, is a specification.

In this invention thecutter is carried at the forward end of a lever of the irst order, and the material to be cut is placed upon a bed which may be turned about its axis, as the cutter in long usewears the bed.l The cutter-carrying lever is actuated by an eccentric normally loose on the main shaft, but which at times is moved with the said shaft by means of a notched disk fast on the said shaft, 'the eccentric carrying a spring-pin, which,when thrust ont from one side of thesaid eccentric, isengaged by the said disk, andwhich remains in engagement with the said pin sufficiently long to turn the eccentric once,rwhen the spring-pin, passing beyond its holding device, liies out ot' engagement with the said notched disk and stops the movement of the lever until the pin is again forced outfrom one side of the eccentric in opposition to its spring, the pin being forced in such direction by contact with a movable wedge controlled preferably by the foot of the operator. C

Figure l represents in plan view a buttonhole cutter embodying my invention; Fig. 2, a partial longitudinal vertical section thereof on the line m Fig. V3, a section and side elevation on the line m2 and Fig. 4, a partial section along the line x3, Fig. l.

The bed A'ot' the machine has standards a2 to support the main shaft B, which has fast upon it the driving-Wheel B2 and the disk C, notched or slotted at e2.

The lever D2, which carries at its front end the usual cutter or knife, o, is pivoted at D3 upon uprights erected on the beduA. The rear end of lever D2, with its connected spring D4, (shown at Fig. 3,) constitutes a fork, which receives within itthe eccentric D, loose on shaftB. The eccentric D is providedxat one side with a recess, (see Fig.4,) in which is placed the clutchpin C2, having a foot-piece, g, and surrounded by a spiral sprin g, j'. The normal condition of the pin c2 is with the foot-piece g extended out from one side of the eccentric, in position to be struck by the inclined face 4 of the pin-mov ing device, (shown as a lever, m, pivoted at m2,)

the said lever being normally held in the position Fig. 2 by a spring, m4. C

With the parts as described the eccentric is loose on the shaft B, and the cutter o is elevated above the cutting-bed 02.

The pawl 1J, having a long slot, p2, and placed on a pin or t'ulerum, p3, and normally lifted or held up' by a spring,p4, and connected by a rod orlink,1o",with a suitable treadle,if depressed by the operator will, by its link, engage the end of lever m, turn it on its l'ulcruin, and cause the inclined face 4 ot' the said lever to strike the foot-piece g of the pin c2 and force it toward the right, (see Fig. 4,) the slot c2 of the notched disk C,fast on shaft B, at that time being opposite the end of the pin c2, thus forcing the said pin against its springf, ont from the eccentric into the said slot, as in Figs. 3 and 4. As soon as the ends of the slot-e2 strike the pin c2 the eccentric starts to rotate with the shaft B, and the foot-piece g of the pin rides up tbe incline 3 of the pin-holding device h, or holding-plate, which is made as a plate or disk screwed fast to one of the standards a2, the

said holding device being cnt away atone edge, p

as shown in Fig. 2, so that as soon as the footpiece g of the pin c2, in the rotation of theeccentric d, arrives opposite the heel or corner l2 of the said pin-holding plate the pin cino longerheld pressed into the eccentric and notch e2 by the said plate h,is retractedby the spring f from the notch e2, which leaves the eccentric at rest. The hook ofthe pawl p holds the lever m against the pin until the foot-piece g gets started on the pin-holding plate, after which the projecting end of the eccentric d strikes the pawl p, removes it back from the lever m,

and lets the said lever turn against its back stop m3. The pin c2 is prevented escaping from the eccentric by the head of a small screw, t. (See Fig. 4.) The edge of the material being cut will rest against the adjustable edge-gage t2. The shank o3 of the cutting--bed o is ex tended down into a portion ofthe frame-work where it is held by a set-screw, o4, which permits the bed to be rotated or turned axially into any desired position.

The mechanism for moving the lever D and leaving it at rest may be employed to good advantage in other than button-hole cutters.

I claiml. The lever, its cutter o, the cutting-bed, l

the shaft B, the notched disk fast thereon,the eccentric loose on the said shaft, the springheld pin therein, and the pin-moving device to force the pin into the notch ofthe said disk, combined With a pin-holding plate to retain the pin in the notch of the said disk during a partial rotation of the said eccentric, substan tial] y as described.

2. The rotating shaft B and notched disk connected with it, and the eccentric loose on the said shaft and provided with a pin, combined with a pin-holding plate to retain the pin in engagement with the notched plate, substantially as described.

3. The shaft B, its connected notched disk,

the eccentric loose thereon, and pin carried by the eccentric, and the plate to hold the pin in engagement with the notched disk, combined with the lever or device having the incline 4 to start the pin upon the plate which keeps it en- ,caged with the notched disk, substantially as described.

4. The shaft B, its attached notched plate, and pin-carrying eccentric loose on the shaft, combined with the lever or device having` an incline, 4, to effect the engagement of the pin with the notched disk, substantially as described.

5. The lever m, combined with the pawl to engage and move it, and an eccentric to release the said pawl from the said lever, subst-antially as and for the purpose described.

6. The lever m and the eccentric, combined with the pawl p, having a long` slet, and the fulcrnm p3, for the pawl, and with means, substantially as described, to move the said pawl longitudinally, as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN W. LUFKIN.

Witnesses:

G. W. GREGORY, W. H. Sres'ToN. 

